Vertical shaft form with cammed stripping units

ABSTRACT

A concrete form assembly for constructing a section of an elevator shaft or the like including an outer form structure and an inner form structure positioned within the outer form structure. The inner or trapped form structure is comprised of vertically disposed side walls and end walls and at least a pair of diagonally opposite stripping corner sections, each of which coacts with associated manually actuated stripping units for stripping the inner form structure from the completed shaft section. Each stripping corner section is movably interconnected with an adjacent end wall and side wall for relative limited horizontal transverse and lateral movements to a concrete pouring position, wherein the concrete engaging surfaces of a stripping corner section are located in planes common to the concrete engaging surfaces of an adjacent end wall and side wall; and to a position for removing the inner form structure wherein the end walls and side walls and corner sections are stripped from the completed shaft section so that the inner form structure can be removed as an integrated unit from the shaft section. Such movements of the stripping corner sections are accomplished by the stripper units which are rotatably mounted on the end walls and side walls for coacting operation with the corner sections.

United States Patent 1191 McCracken Oct. 29, 1974 1 VERTICAL SHAFT FORM WITH CAMMED STRIPPING UNITS [75] Inventor: Lyde S. McCracken, Des Moines,

Iowa

[73] Assignee: Economy Forms Corporation, Des

Moines, lowa 22 Filed:. Feb. 15,1973

211 Appl. No.: 332,681

52 us. 01. 249/152, 249/181 51 Int. Cl 1328b 7/16 [58] Field ofSearch 249/48,51,63,66, 122,

249/144, 146, 152, 178, 180, 184, 186; 425/D1G. 129, DIG. 5, 438; 264/334 3,767,157 10/1973 Davis .1: 249/186 Primary ExaminerRobert D. Baldwin- Assistant Examiner-John McQuade Attorney, Agent, or FirmRudolph L. Lowell [57] ABSTRACT A concrete form assembly for constructing a section of an elevator shaft or the like including an outer form structure and an inner form structure positioned within the outer form structure The inner or trapped form structure is comprised of vertically disposed side walls and end walls and at least a pair of diagonally opposite stripping comer sections, each of which coacts with associated manually actuated stripping units for stripping the inner form structure from the completed shaft section. Each stripping corner section is movably interconnected with an adjacent end wall and side wall for relative limited horizontal transverse and lateral movements to a concrete pouring position, wherein the concrete engaging surfaces of a stripping corner section are located in planes common to the concrete engaging surfaces of an adjacent end wall and side wall; and to a position for removing the inner form structure wherein the end walls and side walls and corner sections are stripped from the completed shaft section so that the inner form structure can be removed as an integrated unit from the shaft section. Such movements of the stripping corner sections are accomplished by the stripper units which are rotatably mounted on the end walls'and side walls for coacting operation with the corner sections. 1

2 Claims, 11 Drawing Figures VERTICAL SHAFT FORM WITH CAMMED STRIPPING UNITS SUMMARY OF THE INVENTION The diagonally opposite pair of stripping corner sections of the inner form structure of the form assembly are positively interconnected at all times to adjacent side walls and end walls for movement into and out of a concrete pouring position by manually actuated stripping units having coacting portions on the corner sections and corresponding walls to align the corner sections and walls. In a pouring position the concrete engaging surfaces of the stripping corner sections are continuous with the concrete engaging surfaces of the end walls and side walls. Any irregularities or blemishes in the surface of the formed concrete structure at the junctions of the corner sections with the end walls and side walls are thus completely eliminated. The end walls and the side walls are readily'stripped from the concrete structure on actuation of the manually operated stripping units which are permanently mounted on the end and side walls. The inner form structure is thus adapted to be handledas an integrated unit for installation and removal purposes and is capable of being set up or stripped in a minimum of time without the necessity of special tools or accessory attachments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a plan view of a concrete form assembly for forming an elevator shaft section showing the inner and outer form structures thereof in a concrete pouring relation;

FIG. 2 is an enlarged detailed foreshortened perspective view of a corner of the inner form structure showing the assembly relation of a stripping corner section with an adjacent end wall and side wall;

FIG. 3 is an enlarged sectional view taken on the line 3-3 in FIG. 2, showing a stripping tool unit and stripping corner section in a concrete pouring position;

FIG. 4 is a sectional view taken on the line 44 in FIG. 3; 7

FIG. 5 is a detail sectional view illustrated similarly to the upper portion of FIG. 3, showing the position of a stripping tool unit when the inner form structure is to be stripped from the completed shaft section;

FIG. 6 is a sectional view taken on the line 66 in FIG. 5, illustrated similarly to FIG. 4, and showing the parts thereof in changed positons;

FIG. 7 is a sectional view illustrated similarly to FIG. 3, showing the position of the stripping tool unit on completion of the stripping of the end and side walls of the inner form structure from the completed shaft section;

FIG. 8 is a sectional view on the line 8-8 in FIG. 7, illustrated similarly to FIGS. 4 and 6 and showing the parts thereof in changed positons;

FIG. 9 is a reduced sectional view illustrated similarly to FIG. 7, showing an adjustable jack meansfor moving an end wall and a side wall relative to an adjacent stripping corner section of the inner form structure;

FIG. 10 is illustrated similarly to FIG. '1 and shows the inner form structure stripped from the completed shaft section so as to be removable therefrom as a package unit; and

FIG. 11 is a perspective view of a stripping tool unit.

DETAILED DESCRIPTION OF THE INVENTION With reference to FIG. 1 of the drawings, there is illustrated a concrete form assembly, designated generally as 15, for constructing a section 16 of an elevator shaft or the like of a tubular rectangular shape in transverse cross section. The assembly includes an outer form structure 17 and an inner form structure 18 comprised of a pair of vertically disposed opposite end forms or walls 19 and a pair of vertically disposed oppositeside forms or walls 21. A first pair of diagonally opposite comer sections 22, hereinafter referred to as rigid or fixed corner sections, are rigidly secured in any suitable manner to an adjacent end wall 19 and side wall 21 such that the concrete engaging surfaces 23 and 24 of a rigid corner section 22 are flush with and located in the planes of the concrete engaging surfaces 26 and 27, respectively, of an end wall 19 and side wall 21, also respectively.

A second pair of diagonally opposite corner sections 28, hereinafter referred to as stripping corner sections, are movably interconnected with an adjacent end wall 19 and side wall 21 for movement of the surfaces 29 and 31 thereof into and out of the planes of the surfaces 26 and 27, respectively, of an end wall 19 and side wall 21, also respectively. This movement of the stripping corner sections 28 is accomplished by the provision of manually operated stripping tool or cam units 32 which are rotatably mounted on the end walls 19 and side walls 21 for a coacting operation with an associated stripping corner section 28.

When the stripping tool units 32 and stripping corner sections 28 are in their relative positions shown in FIGS. 3 and 4, the inner form structure 18 is in its assembly position of FIG. 1, located within and concentrically spaced from the outer form structure 17 providing for the pouring of concrete therebetween to construct the shaft section 16. On manipulation of the stripping tool units 32 from their positions in FIGS. 3 and 4 to their positions shown in FIGS. 7 and 8, the end walls 19 and side walls 21 of the inner form structure 18 are stripped from the constructed shaft section 16 with the stripping corner sections 28 interconnected with the end walls 19 and side walls 21, as illustrated in FIG. 10. The inner or trapped form structure 18 is thus capable of being elevated or removed as an integrated unit from within the shaft section 16.

The end and side walls 19 and 21 are of a metal construction with each thereof being of a generally pan form of a rectangular shape having a bottom wall and a laterally projected perimetric wall. Thus, as shown in FIG. 2, the end wall 19 has a vertically disposed perimetric wall section 33 arranged normal to a bottom wall 34 which constitutes the concrete engaging surface 26. In a like manner, a side wall 21 includes a perimetric wall section 36 arranged normal to a bottom wall 37 which constitutes the concrete engaging surface 27.

Each stripping corner section 28 comprises a body member 38 (FIGS. 2 and 3) of a right angle shape in transverse cross section, the leg portions of which form the concrete engaging surfaces 29 and 31 that terminate in vertical edges 39 and 41, respectively. Spaced inwardly from the vertical edges 39 and 41 and projected in a direction away from the corresponding surfaces 29 and 31 are laterally projected flanges or plates 42 and 42a, respectively. Each plate 42 and 42a is vertically extended in a parallel relation with a corresponding side edge 39 and 41 and terminates in a right angle shoulder 43 and 43a which extend in a direction away from an adjacent side edge 39 or 41.

The perimetric sections or lateral projections 33 and 36 of an end wall 19 and side wall 21, respectively, are movable to positions opposite from and in a spaced parallel relation with corresponding ones of the projections 42 and 42a of a corner section 28. The distance between the spaced plates or lateral projections 33, 42, and 36, 42a, is equal to the distance that a projection 42 and 42a is spaced inwardly from an adjacent vertical edge 39 and 41, respectively, of a stripping corner section 28. By limiting the maximum relative lateral movement between an end wall 19 or side wall 21 with an associated stripping corner section 28, to an amount equal to the spacing between opposed projections 33, 42, and 36, 420, the vertical side edges 39 and 41 of a stripping corner section are positionable in abutting engagement with a projection 33 and 36, respectively. In like manner, a relative transverse movement between an end wall 19 or a side wall 21 with an associated stripping corner section 28 may be limited to provide for the location of a concrete engaging surface 29 and 31 of a corner section 28 in a coplanar relation with a corresponding concrete engaging surface 26 or 27, respectively, of an adjacent end wall 19 or side wall 21, also respectively. These relative transverse and lateral movements to align a stripping corner section with an adjacent end wall 19 and side wall 21, is accomplished by means including the manually actuated cam or stripping tool units 32. Since each stripping tool unit 32 is of a like construction and similarly assembled with an end wall 19 or side wall 21 for alike coacting operation with a stripping corner section 28, only one of such assemblies will be described in detail with like parts being indicated by like numerals.

A stripping tool unit 32 (FIGS. 4 and 11) includes a manually actuated flat lever that has a body section 44 of a generally triangular shape provided at one end with a handle extension 46 and having a spacer extension 47 at the other end thereof. The spacer end 47 is of a thickness equal to the maximum distance at which a projection 42 and 42a is spaced from an edge 39 and 41, respectively, of a stripping corner section 28. lntermediate its ends, the body member 44 has secured thereto, in a side by side relation as by weldments, a cam member 48 of a generally rectangular shape having a cam surface formed with a low section 49, an intermediate section 51 and a high section 52. Extended transversely through the body member 44 and cam member 48, at a position generally centrally thereof, is a bolt 53 that functions as a shaft for rotatably supporting a tool stripping unit 32.

The bolt 53 (FIG. 3) is mounted at one end 54 on an adjacent end wall 19 or side wall 21 by the extension of such bolt end 54 through either a lateral projection 33 or 36, respectively. In this mounting of the stripping tool 32, the body member 44 is positioned with the side thereof remote from the cam member 48 in bearing engagement with the adjacent side of the projection 33 or 36; and with the cam member arranged with the cam surface thereof opposite a shoulder 43 or 43a. Movement of the body member 44 axially of the bolt 53 is prevented by the engagement of the bolt head 56 with the cam member 48 and the engagement of a nut 57 on the bolt 54 with a projection 33 or 36.

Each corresponding pair of opposite projections 33, 42 and 46, 42a are movably interconnected by a connecting bolt 58 for movement toward and away from each other to a predetermined maximum distance equal to the thickness of the spacer end 47 for a purpose to appear later. The bolt 58 extends through an opening (not shown) in a projection 42 or 420, and an arcuate slot 59 formed in a projection 33 or 36. With a pair of opposite projections 33, 42 and 36, 42a spaced apart a distance permitted by a connecting bolt 58 the handle 46 is manipulated to rotate a stripping tool unit 32 in a counterclockwise direction, as viewed in FIG. 4, to locate the spacer extension 47 between such opposed projections to maintain the predetermined maximum spaced relation therebetween. Concurrently with this spacing function of the stripping tool 32, the cam member 48 is rotated to a position wherein the cam low side 49 is in bearing engagement with an associated shoulder 43 or 43a. This position of the stripping tool unit is defined by the engagement of one side of the spacer extension 47 with the connecting bolt 58 and is maintained by a lock bolt 61 extendible through oppositely arranged openings (not shown) in a corresponding pair of the projections 33, 42 and 36, 42a so as to be engageable with the opposite side of the spacer extension 47.

It is seen, therefore, that the spacer extension 47 maintains a laterally fixed relation between the projections 33, 42 and 36, 42a providing for the vertical edges 39 and 41 of a stripping corner section 28 being located in a flush abutting engagement with corresponding projections 33 and 36. Concurrently with this action of the spacer end 47, it is seen that the cam member 48, on movement of the low side 49 thereof into bearing engagement with a corresponding shoulder 43, moves a corner section 28 transversely relative to an adjacent end wall 19 or side wall 21 to a pretermined position wherein the vertical side edge 39 of the corner section continues to abut a projection 33 of the end wall 19 but wherein the corner section surface 29 lies in the plane of the surface 26 of the end wall 19. It is apparent that a stripping tool unit 32 functions similarly relative to a side wall 21 to provide for movement of the corner section surface 31 into the plane of the side wall surface 27 with the vertical edge 41 in abutting engagement with the projection 36. This assembly relation of a stripping corner section 28 with an adjacent end wall 19 and side wall 21 is positively maintained by the lock bolt 61 during the pouring of the shaft section 16.

On completion of the shaft section 16 the inner form structure 18 is stripped from the section 16 for removal as a unit. For this purpose the locking bolt 61 is removed to provide for the rotation of the stripping tool unit 32 in a clockwise direction, as viewed in FIG. 4, relative to the shaft 53. During initial rotation of the stripping tool unit 32 from its position in FIG. 4 to the position thereof in FIG. 6, the spacer extension 47 is retracted from between the projections 33 and 42, during which time the shoulder 43 is engaged by the intermediate cam side 51 to maintain the coplaner relation between the surfaces 26 and 29, shown in FIG. 5.

On a continued rotation of the stripping tool unit 32 in a clockwise direction from its position in FlG. 6 to the position therefor in FIGS. 7 and 8, the cam high side 52 is moved into engagement with the shoulder 43. With the surfaces 29 and 31 of the stripping corner section 28 in full bearing engagement with the shaft section 16 the engagement of the cam high side 52 with the shoulder 43 results in the stripping of the end walls 19 and side walls 21 away from the shaft section 16. This stripping movement takes place relative to a stripping corner section 28 to an extent limited by the length of the arcuate slot 59 which receives the connecting bolt 58. As best appears in FIG. 7 an end wall 19 and side wall 21 are movable transversely toward the projections 42 and 42a on lateral movement of such walls out of engagement with corresponding side edges 39 and 41 of a corner section 28.

To complete the stripping of the inner form structure 18 from theshaft section 16 adjustable jacks 62, corresponding to the stripping corner sections 28, are interconnected with an adjacent end wall 19 and side wall 21 in any suitable manner (FIGS. 1 and 2). On retraction of the jack assemblies 62 the corner sections 28 are stripped from the shaft section 16 so as to completely free the inner form structure or entrapped form 18 from the shaft section. Since the end walls 19 and 21 are rigidly connected to the rigid corner sections 22 and movably connected by the connecting bolts 58 and jack assemblies 62 to the stripping corner sections 28 the entire form 18 is removable as an integrated unit from within the shaft section 16.

To arrange the inner form structure 18 in its concrete pouring position shown in FIG. 1 the jack assemblies 62 are initially extended to provide for the relative adjustment of the stripping corner sections 28 with the end walls 19 and side walls 21 by the stripping tool units 32 to the positions thereof shown in FIGS. 3 and 4. It is contemplated that a plurality of stripping tool units 32 will be utilized in connecting each stripping corner section 28 with an adjacent end wall or side wall. Also, it is to be understood that at least a pair of the jack assemblies 62 (FIG. 2) corresponding to each stripping corner section 28, will be interconnected between the upper and lower ends of an adjacent end wall and side wall.

Although the invention has been described with respect to a preferred embodiment thereof, it is to be understood that it is not to be so limited since changes and modifications can be made therein which are within the full intended scope of this invention as defined by the appended claims.

I claim:

I. A metal form assembly for constructing a concrete shaft section comprising:

a. an outer form structure,

b. an inner form structure located in a spaced relation within said outer form structure to provide for the pouring of a concrete material therebetween to form said shaft section;

c. said inner form structure including vertically disposed side walls and end walls and a pair of diagonally opposite stripping corner sections, each of which is arranged between the adjacent ends of one of said end walls and one of said side walls, and each of which stripping corner sections has a body member of an angular shape in transverse cross section with vertically disposed side edges,

d. first lateral projections corresponding to and extended inwardly from said one end wall and said one side wall at the ends thereof adjacent a stripping corner section,

e. second lateral projections corresponding to said first lateral projections extended inwardly from the body member of a stripping corner section adjacent a vertically disposed side edge thereof at positions spaced from and opposite said first lateral projections,

f. means movably interconnecting opposite ones of said first and second lateral projections to limit the maximum relation therebetween, and

g. a manually actuated stripping tool unit rotatably mounted on each of said first lateral projections including a spacer member and a cam member, said stripping tool unit rotatable to a concrete pouring position for said inner form structure wherein said spacer member is located between opposite ones of said first and second lateral projections to space said projections apart the maximum distance defined by said interconnecting means, and wherein said cam member is engageable with a correspond ing second lateral projection on said body member to move a vertical edge thereof into abutting flush engagement with the adjacent end of a corresponding end wall or side wall,

h. said stripping tool unit, on setting of the formed concrete shaft section, rotatable to an initial stripping position wherein said spacer member is retracted from between opposite ones of said first and second lateral projections, and said cam member is in bearing engagement with a corresponding second lateral projection to concurrently hold a stripping corner section in bearing engagement with the formed shaft section and to force said end walls and side walls out of engagement with the formed shaft section whereby to provide for the movement of the adjacent ends of corresponding end walls and side walls inwardly of the body member of a stripping corner section.

2. A metal form assembly for constructing a concrete shaft section comprising:

a. an outer form structure,

b. an inner form structure positioned in a spaced relation within said outer form structure including vertically disposed side walls and end walls and at least a pair of diagonally opposite stripping corner sections, each corner section having a body member with vertically disposed side edges,

c. means movably interconnecting each corner section with an adjacent side wall and end wall for limited relative lateral and transverse movements,

d. a plurality of coacting means on a corner section and on the side wall and end wall adjacent thereto operable to move a corner section into and out of a position wherein said vertically disposed side edges are in abutting engagement with a corresponding adjacent side wall and end wall, and

e. means for releasably locking a corner section in said position against movement relative to an adjacent side wall and end wall,

each of said coacting means including a pair of rotatable operating members rotatable together about a common axis, one of said operating members providing relative transverse movement between a corner section and adjacent end wall and side wall into said position, and the other of said operating members constituting a spacer member for holding a corner section in said position against lateral movement toward an adjacent side wall and end wall. 

1. A metal form assembly for constructing a concrete shaft section comprising: a. an outer form structure, b. an inner form structure located in a spaced relation within said outer form structure to provide for the pouring of a concrete material therebetween to form said shaft section; c. said inner form structure including vertically disposed side walls and end walls and a pair of diagonally opposite stripping corner sections, each of which is arranged between the adjacent ends of one of said end walls and one of said side walls, and each of which stripping corner sections has a body member of an angular shape in transverse cross section with vertically disposed side edges, d. first lateral projections corresponding to and extended inwardly from said one end wall and said one side wall at the ends thereof adjacent a stripping corner section, e. second lateral projections corresponding to said first lateral projections extended inwardly from the body member of a stripping corner section adjacent a vertically disposed side edge thereof at positions spaced from and opposite said first lateral projections, f. means movably interconnecting opposite ones of said first and second lateral projections to limit the maximum relation therebetween, and g. a manually actuated stripping tool unit rotatably mounted on each of said first lateral projections including a spacer member and a cam member, said stripping tool unit rotatable to a concrete pouring position for said inner form structure wherein said spacer member is located between opposite ones of said first and second lateral projections to space said projections apart the maximum distance defined by said interconnecting means, and wherein said cam member is engageable with a corresponding second lateral projection on said body member to move a vertical edge thereof into abutting flush engagement with the adjacent end of a corresponding end wall or side wall, h. said stripping tool unit, on setting of the formed concrete shaft section, rotatable to an initial stripping position wherein said spacer member is retracted from between opposite ones of said first and second lateral projections, and said cam member is in bearing engagement with a corresponding second lateral projection to concurrently hold a stripping corner section in bearing engagement with the formed shaft section and to force said end walls and side walls out of engagement with the formed shaft section whereby to provide for the movement of the adjacent ends of corresponding end walls and side walls inwardly of the body member of a stripping corner section.
 2. A metal form assembly for constructing a concrete shaft section comprising: a. an outer form structure, b. an inner form structure positioned in a spaced relation within said outer form structure including vertically disposed side walls and end walls and at least a pair of diagonally opposite stripping corner sections, each corner section having a body member with vertically disposed side edges, c. means movably interconnecting each corner section with an adjacent side wall and end wall for limited relative lateral and transverse movements, d. a plurality of coacting means on a corner section and on the side wall and end wall adjacent thereto operable to move a corner section into and out of a position wherein said vertically disposed side edges are in abutting engagement with a corresponding adjacent side wall and end wall, and e. means for releasably locking a corner section in said position against movement relative to an adjacent side wall and end wall, f. each of said coacting means including a pair of rotatable operating members rotatable together about a common axis, one of said operating members providing relative transverse movement between a corner section and adjacent end wall and side wall into said position, and the other of said operating members constituting a spacer member for holding a corner section in said position against lateral movement toward an adjacent side wall and end wall. 